Kilocalories (food Calories) to British thermal units
Type a value in Kilocalories (food Calories) and get the result in British thermal units, calculated exactly.
100 Kilocalories (food Calories) ≈ 396.5666831 British thermal units
Exact factorRounded for display to about 10 significant digits.
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Formula
BTU = kcal × 3.96566683139
To convert Kilocalories (food Calories) to British thermal units, multiply the value by 3.96566683139.
Worked examples
- 1 kcal × 3.96566683139 ≈ 3.965666831 BTU
- 100 kcal × 3.96566683139 ≈ 396.5666831 BTU
- 50 kcal × 3.96566683139 ≈ 198.2833416 BTU
This factor is exact by definition.
Conversion table
| Kilocalories (food Calories) (kcal) | British thermal units (BTU) |
|---|---|
| 1 | ≈ 3.965667 |
| 2 | ≈ 7.931334 |
| 3 | ≈ 11.897 |
| 4 | ≈ 15.86267 |
| 5 | ≈ 19.82833 |
| 6 | ≈ 23.794 |
| 7 | ≈ 27.75967 |
| 8 | ≈ 31.72533 |
| 9 | ≈ 35.691 |
| 10 | ≈ 39.65667 |
| 15 | ≈ 59.485 |
| 20 | ≈ 79.31334 |
| 25 | ≈ 99.14167 |
| 30 | ≈ 118.97 |
| 40 | ≈ 158.6267 |
| 50 | ≈ 198.2833 |
| 60 | ≈ 237.94 |
| 70 | ≈ 277.5967 |
| 75 | ≈ 297.425 |
| 80 | ≈ 317.2533 |
| 90 | ≈ 356.91 |
| 100 | ≈ 396.5667 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: British thermal units to Kilocalories (food Calories)
| British thermal units (BTU) | Kilocalories (food Calories) (kcal) |
|---|---|
| 1 | ≈ 0.2521644 |
| 2 | ≈ 0.5043288 |
| 3 | ≈ 0.7564932 |
| 4 | ≈ 1.008658 |
| 5 | ≈ 1.260822 |
| 6 | ≈ 1.512986 |
| 7 | ≈ 1.765151 |
| 8 | ≈ 2.017315 |
| 9 | ≈ 2.26948 |
| 10 | ≈ 2.521644 |
| 15 | ≈ 3.782466 |
| 20 | ≈ 5.043288 |
| 25 | ≈ 6.30411 |
| 30 | ≈ 7.564932 |
| 40 | ≈ 10.08658 |
| 50 | ≈ 12.60822 |
| 60 | ≈ 15.12986 |
| 70 | ≈ 17.65151 |
| 75 | ≈ 18.91233 |
| 80 | ≈ 20.17315 |
| 90 | ≈ 22.6948 |
| 100 | ≈ 25.21644 |
Convert British thermal units to Kilocalories (food Calories)
Unit definitions
- Kilocalories (food Calories) kcal
- Exactly 4184 joules; the "Calorie" on food labels.
- British thermal units BTU
- The International Table BTU: exactly 1055.05585262 joules.
Questions people ask
Kilocalories (food Calories) to British thermal units: what is the conversion factor?
One kcal is ≈ 3.965666831 BTU.
How do I convert Kilocalories (food Calories) to British thermal units?
Use the formula above. For example, 100 kcal = ≈ 396.5666831 BTU.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.